Trussed-end paperboard carton



Nov. 29, 1960 N. B. HANSEN 2,962,202

' TRUSSED-END PAPERBOARD CARTON Filed Oct. 23. 1957 2 Sheets-Sheet 1 IINVEN TOR.

NlLS B. HANSEN BY M2 147%?! Arrows-rs Nov. 29, 1960 N. BPHANSEN2,962,202

musssn-snn PAPERBOARD cmon Filed Oct. 23, 1957 2 Sheets-Sheet 2 j i Q) gL ED J INVENTOR.

NSLS B. HANSEN United States Patent TRUSSED-END PAPERBOARD CARTON NilsB. Hansen, Marietta, N.Y., assignor to Continental Can Company, Inc.,New York, N.Y., a corporation of New York Filed Oct. 23, 1957, Ser. No.691,832

1 Claim. (Cl. 229-37) The invention relates to an improvement in endclosures for paperboard cartons.

Much attention has been given in years past to the problem of designingstrong sift-proof cartons. In order to accomplish this object in thegeneral type of carton which includes pairs of inner and outer end flapsextending from pairs of opposed side wall panels, it has been consideredquite essential to have the outer pair of end flaps overlap over a verysubstantial area and preferably over the entire area of the end of thecarton. The principal drawback to this is that it consumes a largequantity of paperboard and so increases the cost. But as such cartonshave been so well suited to the packaging of so many products, they havebecome perhaps the most widely used of all carton types, and the cost ofusing the wide overlapping outer flaps has come to be accepted asinherently necessary in order to obtain a top quality package. Myinvention relates to a discovery of how to reduce the cost of using thewide overlapping flaps while retaining the essential wide overlap andqualities of good strength and effective sealing.

What I have accomplished is, in a sense, to build a truss section intothe end of the carton. I do this by notching the ends of the outer pairof flaps in such a way that, when closed and sealed, they overlie oneanother along a sinuous glue lap. As the notched ends are secured to oneanother over substantially the area of this sinuous glue lap, thisresults in forming what may be best described as a double thicknesstruss. Also, because the first outer flap, when folded, can extend forthe full width of the carton, complete scaling is afforded across thebase of the adjacent inner end flap. In this respect one of thefundamental advantages of the wide overlapping outer flaps is retained,but because of the notched ends there is a very considerable saving inthe amount of paperboard used, with consequent reductions in cost of theproduct. And the built in truss section contributes both strength andlightness to the package.

Referring to the drawings, I shall now describe the best modecontemplated by me for carrying out my invention.

Fig. 1 is a perspective view of a carton which includes my improved endclosure, with the outer end flaps open.

Fig. 2 is the same as Fig. 1 except that here the flaps are all closedand sealed.

Fig. 3 is a diagram of the truss section, taken as indicated at 3-3 inFig. 2, showing the sinuous overlapping area of the two outer end flaps.

' Fig. 4 is a face view of a section of a paperboard sheet from whichthe blank for the carton of Figs. 1 and 2 is cut and scored.

My invention is applied to a carton of the general type which includes abody having four side wall pa: cls 1,2, 3, 4, panels 1 and 4 beingsecured together by a conventional glue flap 5, a pair of inner endflaps 6, 7, and a pair of outer end flaps 8, 9, extending from pairs ofopposed side wall panels. In Fig. 4, the dot-dash lines represent foldlines which usually are made as score lines formed when the blanks B areproduced. Conventional cutting and scoring dies may be used for thesepurposes. According to my invention the outer end flaps 8 and 9 havenotched ends, the notches being indicated at 10, 11. The notches 10 offlap 8 are offset with respect to notches 11 of flap 9 as shown in Figs.1 and 4. When these flaps are folded as shown in Fig. 2, their notchedends overlie one another along a sinuous glue lap, and the ends aresecured together over substantially the area of the glue lap, this beingthe area shown diagrammatically at a in Fig. 3. The sinuous glue lapextends diagonally back and forth between opposed edges 12, 12 of theend of the carton. Section a forms a double thickness truss at the endof the package which is quite strong, stiff, and light in weight.Besides this, my construction still alfords full width sealing betweenflap 8 and each of flaps 6 and 7.

Glue is applied to the end flaps in a conventional manner over areas ofthe flaps which will produce adherence between outer flaps 8 and 9 oversubstantially the area of the truss shown diagrammatically at a in Fig.3, and which also will produce adherence between the outer flap 8 andeach of the inner flaps 6 and 7 over corner sealing areas which extendat least along substantially the bases of flaps 6 and 7 as indicated bythe shaded areas b in Fig. 1. Ordinarily the glue which producesadherence over area a will be applied to the inside of flap 9, and thatwhich produces adherence over the corner sealing areas b will be appliedto the inside of flap 8.

As shown in Fig. 4, the notches 10 and 11 in the flaps at one end of thepaperboard blank are oifset with respect to those in the flaps at theother end. In view of this it is possible, not only to obtain thesinuous double thickness truss construction, but also to have nestingblanks all of which are identical in form as distinguished from certainnesting blank arrangements heretofore suggested where notched flaps havebeen proposed for other purposes. This feature of having identicalnesting blanks is in addition to the primary one of providing thetrussed end closure.

The terms and expressions which I have employed are used in adescriptive and not a limiting sense, and I have no intention ofexcluding such equivalents of the invention described, or of portionsthereof, as fall within the scope of the claim.

I claim:

In a paperboard blank for a folding carton of the general type whichincludes a body having four side wall panels and pairs of inner andouter end flaps extending from the ends of pairs of opposed side wallpanels, the end closure construction in which said outer end flaps havenotched ends, the notches in one of the outer flaps of each pair beingoffset with respect to those in the other outer flaps of the respectivepairs, and the notches in the outer end flaps at one end of thepaperboard blank being offset with respect to those in the outer endflaps at the other end of the paperboard blank, whereby successiveblanks cut from a paperboard sheet are identical in form.

References Cited in the file of this patent UNITED STATES PATENTS221,165 Ferry Nov. 4, 1879 776,768 Rheutan Dec. 6, 1904 2,367,717Davidson Jan. 23, 1945 2,702,663 Klein Feb. 22. 1955

